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		<p>定义一个客户端图像映射。图像映射（image-map）指带有可点击区域的一幅图像。</p>
		<img src="../img/eg_merglobe.gif" width="300px" height="300px" border="0" usemap="#planetmap" alt="Planets" />

		<map name="planetmap" id="planetmap">
  <area shape="circle" coords="180,139,14" href ="venus.html" alt="Venus" />
  <area shape="circle" coords="129,161,10" href ="mercur.html" alt="Mercury" />
  <area shape="rect" coords="0,0,110,260" href ="sun.html" alt="Sun" />
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